Method of ornamenting metal surfaces



Nov. 28, 1933. l., GRlEs v 1,937,146

METHOD 0F ORNAMENTING METAL SURFACES Filed March-4, 19:51

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Patented Nevxzs,1932'. y j 1,937,146

v l1,937,146 l `'METHOD oF ORNAMENTING METAL"v n sUmiAEsi,A

, K Louisfiries, Chicago, v Application ,Dial-chil,1931. Seriall\,I o.5l2`0,099l 'I 3- claims. (o1. Asis-5.7) Y- Y K v ,y The invention relates to improvements inmethered with thisrcoating, it is revolved over agentle ods of ornamentingmetal surfaces andghasfor heat to cause even and rapiddryingnThis prol c its `primary object the provision ofanimproved cedure should be carriedfjout in afdark room or f method of the character indicated by means of in a-very weak lightand untilthe emulsion coatwhich metal surfaces of various :kinds maybe ing is thoroughlydry. "Theheating is then. dis- ('50` readily-and economically ornamented with iigcontinued and the plateallowedto cool. A ures of variousdescriptions. l Aftersaid'plate hasgcooled,y thephotographic Another object` of the invention is the provinegative prepared asstated above is placed .in

sion of an improved method of thecharacter incontactwithl the coated sideof the plate and the dic'ated whereby` f such metal surfaces may be negative Ythen xposedto a sourceof-bright light. 65T

ornamented with silhouette figures in relief. Theexpos'ure to the light will cause the emulsion Other objects will appear hereinafter. under the transparent portions of the negative 'Ihe invention consists in the methods of proto become insoluble, the other portions,itha't,is,

c'edure hereinafter dscribed and claimed. the portions around the silhouette image vre- Y The invention will be best understood by refmaining soluble.

erence to the accompanying drawing forming a After this exposure, the plate is washed inwa-l part of the specification and in which ter to remove the soluble portions of the coatingV, Figure l is a face view of a medallion ornathereby leaving the surface of the plate coatedv mented by a method embodying they invention; `only to correspond with` the silhouette image. l 20 Figure 2, a horizontal section of the same taken The resultantplate isthen slowly dried by baking 75 on line 2 2 of Fig. l; under heat and said baking is continued until f Figure 3, a viewv similar to Fig. l but showing the image becomes ,uniformly black. `The plate f the method employed in providing an ornamental is then placed on a slab and allowed to cool. figure in relief and To nish the plate,'it is dipped in the follow--r` Figure 4, a section taken on line 4 4 of Fig. 3. ing solution:

In carrying on the method, a silhouette photo- W c v 1 ater l I l gallon alsnlllerelfgfagea Ilay rlalraof Sodium bichromate 5.6 ounces p y Commercial sulphuric acid; r5.6 ounces make said silhouette negative, a powerful source of light is placed behind-a semi-transparent white It is permitted to remain'in this solution'for. 85 I screen and the subject placed between this screen a few minutes and until a satin nish is `obtained andthe camera in such a way that a silhouette on the uncoated portions or silhouette backimage is obtained on the negative. In the exemground of the plate. TheV plate is then dried pliiication of the invention illustrated in the and sprayed with lacquer toprevent injury or drawing, the subject is the profile of the head corrosion and is then completed for use An 90 of a man smoking a pipe, and such treatment will exemplication of a plate or medallion thus prop result in the imprinting of his prole silhouette duced is shown in Figs. l and 2 lof the drawing on a photographic negative. The iilm negative Vin which the background is indicated by the'refv thus obtained is then developed in the usual way` erence numeral 12 and the silhouette image by Y Y 95v The metal surface toV be ornamented is then In Figs. 3 and 4 of the drawing, I vhave illuscovered by a coating of light-sensitive material. trated an etchedl plate produced by `means of the Y In the exemplification illustrated, av smooth process as follows. To accomplish this after the grained oval copper plate 10 has its facev thorbaking prOCeSStO produce the blaCk image, the

oughly cleaned by polishing with charcoal or plate is cooled and the back thereof coated with 1'00 powdered pumice which is then covered with a, shellac which is permitted to dry.r The plate thus coating compound. For practical purposes, this preparedis then dipped in a SOllltiOn 0f lJeIChlO- coating may consist of the following emulsion: ride of iron which attacks and dissolves theuncoated backgroundportions 14 of the plate, dis- Water 30 ounces f 50. I solving the same and therebyetching to the de- 1105 Le tages photo'engravers glue @Ounces sired depth to'piaee the bleek image 13 in renefl 25 grains or outwarmy offset. when the desired depth of.

Aqua ammonia concentrated ladrops `etch 1s obtained, the plate -1s removed from the y perchloride solution and thoroughly rinsed in wa- Y 55.' After the face of the plate is thoroughly cov-V ter and dried. .v ll() The plate thus produced is then dipped in the KVbichrornate or finishing solution and nished as alcove specified for completing the medallion.

Another method of finishing the plate or medallion is as follows. After the plate has been A baked and etched as above set forth, the image vention into effect, thisy is capable of variation Y and modification Without' departing vfrom the lspirit of the invention. I, therefore', do notv wish to belimited to the precise details of. construc- 'coating is removed with alcohol or gasoline and the plate thenelectroplated, yasvvith nickel.. Thisv Will form thersilhouette figure or image-infr relief and nickel plated so as to guard against injury or corrosion.

Y VThe ornamental metal surfacesA thus produced may be employed for ornamenting medallions, Watch 'cases or other vmetal surfaces and the figures formed thereon in silhouette may, of course,

be varied infinitely.r In thismanner, metal. surfaces may be provided with various forms of de- ,Y

sirable ornamentation at' comparatively little cost. i f

While I have illustrated and described the preferred form of construction for carrying my intion set forth but desirefto avail myself of such Y se;

variations andmodiiications as come Within; the scopeof the appended claims.A v

Iclairn:v 1; The method of .ornamenting the surface of a solution of sodium bichromate and sulphuric acid.

Y 2. The method of ornamenting the surface of a metal soluble in perchloride of iron Which consists in rst covering said surface with a lightsensitive coating'y then exposing said surface to iight passing through a photographic negative;

then Washing said surface in Water; then slowly dryingthe-surface by the application of heat continued until the'imagebecomes uniformly'black; Y l

then subjecting said surface to the action of a Ysolution of perchloride of iron; and then subjecting the surface to the action of a solution of sodiumbichromate and sulphuric acidr 3. The methcct of ornamenting the siirfaace-V of a metalsoluble in perchloride of iron which con.'-

/sists in forming. a'figurethereon coated to protect it from chemical action; then subjecting said surface to the action of a solution of perchloride of iron; and then subiecting said surface tothe action of a solution of sodium bichromate and sulphuric acid, Y. *Y

Y 11ol 

